The throttle is hooked to the throttle linkage at the carburetor. It goes through the hole in the rod that comes up from the belcrank on the side of the block. It has a stop in the end. The idea was that the cable would slip back and forth in the hole during normal driving. The idea wasn't very good. The stop usually broke and the cable was replaced with a cotter pin or nail in the hole. We had bob tail trucks that delivered gas out in the country in those days. When the throttle broke, we stuck a coin or a washer in the carb linkage to idle them up. The stop is a round tube that the wire goes through and has a set screw. Some electical boxes use something very similar. All European connections use them because they use no wire nuts. As for tires, I guess you do know that if you have tube type tires now, tubeless will not work on your rims. There is nothing wrong with tube type tires. My father ran tube type tires from the late 30's until I switched to tubeless in the late 70's. I think BF Goodrich came out with tubeless in about 48. It wasn't until 1957 that car rims were actually designed for tubeless.
